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Category:   Device (Encryption/VPN)  >   Citrix NetScaler Vendors:   Citrix
(Citrix Issues Fix for Citrix NetScaler Service Delivery Appliance) Xen MSI Message Data Access Control Flaw Lets Local Guest Users Cause Denial of Service Conditions on Other Guest Systems
SecurityTracker Alert ID:  1036516
SecurityTracker URL:  http://securitytracker.com/id/1036516
CVE Reference:   CVE-2015-4103   (Links to External Site)
Date:  Aug 3 2016
Impact:   Denial of service via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 10.1.x prior to version 10.1 Build 133.9; 10.5.x prior to versions 10.5 Build 58.11 and 10.5 Build 57.7005.e
Description:   A vulnerability was reported in Xen. A local administrative user on the guest system can cause denial of service conditions on other guest systems. Citrix NetScaler Service Delivery Appliance is affected.

A local administrative user on a guest system can write to the host MSI message data field, which may cause an error in host-based interrupt handling and adversely affect other guest systems.

x86 systems are affected. ARM systems are not affected.

HVM guest systems with their device model run in Dom0 and with access granted to physical MSI-capable PCI devices can exploit this flaw.

Jan Beulich of SUSE reported this vulnerability.

Impact:   A local administrative user on the guest system can cause denial of service conditions on other guest systems.
Solution:   Citrix has issued a fix for CVE-2015-4103 for Citrix NetScaler Service Delivery Appliance (10.1 Build 133.9, 10.5 Build 58.11, 10.5.e Build 57.7005.e).

Version 11.0 is not affected.

The Citrix advisory is available at:

http://support.citrix.com/article/CTX206006

Vendor URL:  support.citrix.com/article/CTX206006 (Links to External Site)
Cause:   Access control error

Message History:   This archive entry is a follow-up to the message listed below.
Jun 2 2015 Xen MSI Message Data Access Control Flaw Lets Local Guest Users Cause Denial of Service Conditions on Other Guest Systems



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